Patterned Conductive Coating for OLED Electrode IR Drop Reduction
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Solution Overview
Problem
The challenge in manufacturing OLED devices lies in the high sheet resistance of thin film electrodes, which leads to current-resistance (IR) drops, and the complexity and cost of using shadow masks for patterning auxiliary electrodes, limiting mass production and optical performance tuning.
Innovation Solution
A method involving a nucleation inhibiting coating and a patterning structure is used to deposit a conductive coating without a mask, connecting auxiliary electrodes to the second electrode, reducing sheet resistance and enabling precise optical tuning by allowing deposition of conductive coatings in shadowed regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional shadow masks are used for patterning conductive coatings, then pattern precision can be achieved, but device complexity and manufacturing cost increase due to mask warping, degradation, and limited pattern flexibility
Solution Approach 1:
The patent extracts the patterning function from the traditional shadow mask and transfers it to the auxiliary electrode structure itself. The auxiliary electrode serves dual purposes: as an electrical connection element and as a patterning template, eliminating the need for separate shadow masks and their associated complexity.
Solution Approach 2:
The auxiliary electrode is designed to perform multiple functions simultaneously: it provides electrical connection between transparent electrodes, serves as a patterning template for conductive coating deposition, and reduces sheet resistance. This multi-functionality eliminates the need for separate shadow masks and simplifies the manufacturing process.
2Manufacturing precision
If traditional shadow masks are used for patterning, then pattern definition is achieved, but productivity decreases due to costly and complex manufacturing processes
Solution Approach 1:
The auxiliary electrode structure serves itself as the patterning template. The conductive coating is deposited using the auxiliary electrode's own geometry as the mask, eliminating the need for external shadow masks that require manufacturing, alignment, and replacement, thereby enabling mass production.
Solution Approach 2:
The patent merges the auxiliary electrode and the patterning mask into a single integrated structure. This combination eliminates the need for separate shadow mask components and their associated handling, alignment, and replacement processes, significantly improving productivity for mass production.
3Illumination intensity
If transmissive electrodes are used in top-emission OLED devices, then light emission is enabled, but sheet resistance increases leading to inefficient power distribution
Solution Approach 1:
The auxiliary electrode introduces localized conductive regions at specific positions (corners or edges) of the transmissive electrode. This local quality enhancement provides targeted electrical connection points that reduce sheet resistance and improve power distribution efficiency without compromising the overall light emission properties of the transmissive electrode.
Solution Approach 2:
The auxiliary electrode acts as an intermediary element between the transparent electrodes and the conductive coating. It provides a low-resistance electrical pathway that mediates the power distribution across the transmissive electrode, enabling efficient current flow while maintaining light transmission properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces IR drops and enhances optical performance by effectively connecting electrodes, facilitating mass production and precise optical tuning of OLED devices.
Implementation Method 1
a patterning structure arranged to overlap with the auxiliary electrode... treating the nucleating inhibiting coating and the shadowed region to deposit a conductive coating in the shadowed region
Implementation Method 2
a conductive coating disposed in the shadowed region, the conductive coating electrically connecting the auxiliary electrode and the second electrode
Implementation Method 3
a nucleation inhibiting coating disposed over at least a portion of the second electrode... treating the nucleating inhibiting coating and the shadowed region to deposit a conductive coating in the shadowed region
Data Source
AI summary
An opto-electronic device includes: (i) a substrate having a surface; (ii) a first electrode disposed over the surface; (iii) a semiconducting layer disposed over at least a portion of the first electrode; (iv) a second electrode disposed over the semiconducting layer; (v) a nucleation inhibiting coating disposed over at least a portion of the second electrode; (vi) a patterning structure disposed over the surface, the patterning structure providing a shadowed region between the patterning structure and the second electrode; (vii) an auxiliary electrode disposed over the surface; and (viii) a conductive coating disposed in the shadowed region, the conductive coating electrically connecting the auxiliary electrode and the second electrode.